I'm unsure what your "space reporting" needs entail... can you provide details? It seems to me most of the info you'd typically need (ownership & occupancy, equipment & other asset inventories, 'space' or building/floor/room attributes, etc.) can be captured in Lucity/GIS as it is in Archibus/CAD. Is a move from CAD to GIS a possibility?
I'm unfamiliar with Archibus but I've read read up some on 'space reporting' & have looked into how another system (FAMIS) works in conjunction with CAD. While I understand CAD has strengths that GIS does not, I believe most of your drawing needs could be accommodated in GIS, in which case you'd have a comparable mapping/CMMS interface, and one you could serve up to a broad user base (for instance receiving facility maintenance requests from all employees).
But to address your specific request, in my experience Lucity's facilities maintenance clients haven't gone very deep into drawing or mapping details of their spaces - though they may capture loads of detail in CMMS alone (just not mapped). They typically manage facility maintenance at the 'building' or 'room' level (with or without integration to a GIS map), and deal with equipment assets as lists (ie. every asset is named & searchable by name, type, location, etc.) I've not seen anyone mapping detailed amenities & equipment like fire extinguishers, but there's no reason they couldn't. (I believe we have clients who've mapped vertical assets in treatment plants, so it's certainly doable.)
If you want to discuss your needs in more detail, including what an Archibus integration might look like, just let me know. I think we could also round up some facility maintenance client references if you like.